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The Armorer's Manual (6) is a Recipe Book in Elden Ring. Recipe books are records of crafting techniques that players can use to learn how to craft a wide variety of items. We will see where to find the Armorer's Manual (6) and how to use it.

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Key items are used for quests, to unlock places, to learn spells or crafting recipes.

Image from the Armorer's Manual (6) in Elden Ring:

Descriptions from the Gunsmith's Manual (6):

Treaty of artisanal techniques abandoned by a gunsmith who served under the great general Radahn.
There are tips for fighting putrefaction, especially through the application of fire.

Teaches how to craft the following item:

Immunizing Pellets

Item name in English: "Armorer's Cookbook(6)"

Locations of the Gunsmith's Manual (6). Where to find the Gunsmith's Manual (6) in Elden Ring.

The Gunsmith's Manual (6) can be found on a corpse on Siofra's River, sitting on the edge of a cliff, next to some enemies. From the Siofra's River Banks Grace site, jump onto the ledges behind you next to the pillar using Torrent, then follow the cliff to the west.